RSA加密的方式和解密方式实现方法(推荐)

package com.mstf.rsa; import java.security.KeyFactory;import java.security.KeyPair;import java.security.KeyPairGenerator;import java.security.PrivateKey;import java.security.PublicKey;import java.security.interfaces.RSAPrivateKey;import java.security.interfaces.RSAPublicKey;import java.security.spec.PKCS8EncodedKeySpec;import java.security.spec.X509EncodedKeySpec; import javax.crypto.Cipher; import com.sun.org.apache.xerces.internal.impl.dv.util.Base64; public class RSAsecurity {  public static String src = "admin";  public void priENpubDE() {   try {   // 初始化秘钥   KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");   // 秘钥长度   keyPairGenerator.initialize(1024);   // 初始化秘钥对   KeyPair keyPair = keyPairGenerator.generateKeyPair();   // 公钥   RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();   // 私钥   RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();    // 2.私钥加密，公钥解密----加密   // 生成私钥   PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());   KeyFactory keyFactory = KeyFactory.getInstance("RSA");   PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);   // Cipher类为加密和解密提供密码功能，通过getinstance实例化对象   Cipher cipher = Cipher.getInstance("RSA");   // 初始化加密   cipher.init(Cipher.ENCRYPT_MODE, privateKey);   byte[] result = cipher.doFinal(src.getBytes());   System.out.println("私钥加密，公钥解密----加密:" + Base64.encode(result));    // 3.私钥加密，公钥解密----解密   // 生成公钥   X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(rsaPublicKey.getEncoded());   keyFactory = KeyFactory.getInstance("RSA");   PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);   cipher = Cipher.getInstance("RSA");   // 初始化解密   cipher.init(Cipher.DECRYPT_MODE, publicKey);   result = cipher.doFinal(result);   System.out.println("私钥加密，公钥解密----解密:" + new String(result));  } catch (Exception e) {   // TODO Auto-generated catch block   e.printStackTrace();  }  }  public void pubENpriDE() {  try {   // 1.初始化秘钥   KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");   // 秘钥长度   keyPairGenerator.initialize(512);   // 初始化秘钥对   KeyPair keyPair = keyPairGenerator.generateKeyPair();   // 公钥   RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();   // 私钥   RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();    // 2.公钥加密，私钥解密----加密   X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(rsaPublicKey.getEncoded());   KeyFactory keyFactory = KeyFactory.getInstance("RSA");   PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);   // 初始化加密   // Cipher类为加密和解密提供密码功能，通过getinstance实例化对象   Cipher cipher = Cipher.getInstance("RSA");   cipher.init(Cipher.ENCRYPT_MODE, publicKey);   // 加密字符串   byte[] result = cipher.doFinal(src.getBytes());   System.out.println("公钥加密，私钥解密----加密:" + Base64.encode(result));    // 3.公钥加密，私钥解密-----解密   PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());   keyFactory = KeyFactory.getInstance("RSA");   PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);   // 初始化解密   cipher.init(Cipher.DECRYPT_MODE, privateKey);   // 解密字符串   result = cipher.doFinal(result);   System.out.println("公钥加密，私钥解密-----解密:" + new String(result));   } catch (Exception e) {   // TODO Auto-generated catch block   e.printStackTrace();  }  }}